MGSSJ2, Agreed, izuna would be the most likely option here, though i still have my hopes up for obito, who knows maybe he got the rest of his body manifested by a zetsu clone, or maybe they used the edo tensei on him in made it so it couldnt be released? Recall what he said to kakashi about "not remembering my face".Added (2012-08-13, 5:58 AM)
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Hc2, I take it back, im pretty sure its obito, either that or its izuna, but for it to be izuna he wouldve had to steal obito's eye, since it was revealed that both his and kakashis sharingan were once obitos, or are still obitos.